"Máire Dhall", also known as "Blind Mary", is an Irish planxty in 2/4 time and D Major. The tune is attributed to blind Irish harper Turlough O'Carolan (1670-1738), although Donal O'Sullivan could find no incontrovertible evidence of its origin. It was copied by Chief Fancis O'Neill from Co. Cork collector William Forde's two-volume Encyclopaedia of Melody (c. 1845), which carried the attribution to O'Carolan. Unfortunately, only the first volume survives in the O'Neill papers donated to Notre Dame University and it is presumed that "Máire Dhall" is in the second, a copy of which has not been located in Ireland, Britain or the United States. Donal O'Sullivan (1958) does not think the piece characteristic of O'Carolan's melodies and says "But for Forde's high authority we should hardly be justified in including it" in his collected O'Carolan works. If Carolan did compose the tune, it was probably for another blind harper named Máire Dhall (Blind Mary) who lived in his locality and whom he undoubtedly knew. Máire Dhall was a professional harper (one of the few women recorded as being in the profession) who taught another blind woman, Rose Mooney, who appeared at the Belfast Harp Meeting of 1792, one of the last gatherings of ancient Irish harpers). Harper Charles O'Conor's diary mentions that in October, 1726, his two younger brothers were learning harp from a woman harper named Máire Dhall. It was printed in Complete Collection of Carolan's Irish Tunes (1984), P.M. Haverty's One Hundred Irish Airs vol. 3 (1859), S. Johnson's The Kitchen Musician No. 3: Carolan (1983), Joyce's Old Irish Folk Music and Songs (1909), Ó Canainn's Traditional Slow Airs of Ireland (1995), O'Neill's Music of Ireland: 1850 Melodies (1903), O'Sullivan's Carolan: The Life, Times and Music of an Irish Harper (1958) and Ossian's The Complete Works of O'Carolan (1989). It was recorded by Derek Bell on Carolan's Receipt (1987) and The Chieftains on Bonaparte's Retreat (1976).